- Races, Port Washington
- Radio & Television Repair Shops , Port Washington - TV Repair
- Radiotelephone Communications, Port Washington
- Real Estate, Port Washington - Agent, Broker & Companies
- Real Estate Agencies, Port Washington
- Real Estate Agent - Property Lessors, Port Washington
- Real Estate Appraisers & Consulting Services, Port Washington
- Real Estate Consultants, Port Washington
- Real Estate Management, Port Washington
- Real Estate Services, Port Washington
- Reconstructionist Synagogues, Port Washington
- Record Labels, Port Washington - Record Companies
- Record Storage, Destruction & Management, Port Washington
- Records, Tapes, CDs - Used & Vintage, Port Washington
- Records, Tapes, Compact Discs Wholesale, Port Washington
- Recreation Facilities Management, Port Washington
- Recreation Management Services, Port Washington
- Recreational Equipment Repair & Service, Port Washington
- Recreational Organizations, Port Washington
- Recreational Services, Port Washington
- Recycling Drop-Off Centers, Port Washington
- Reducing Exercise & Weight Control Services, Port Washington
- Refrigerator Sales, Service & Repair, Port Washington - Fridge
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- Refuse Collection & Disposal Services, Port Washington
- Regulation Miscellaneous Commercial Sectors, Port Washington
- Rehabilitation Centers, Products & Services, Port Washington
- Rehabilitation Specialists, Port Washington
- Rehabilitational Job Training Services, Port Washington
- Religious Education, Port Washington
- Religious Organizations, Port Washington
- Repair Services, Port Washington
- Research & Development Bureaus, Port Washington - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Port Washington - Laboratories
- Research Services, Port Washington
- Resident Camps, Port Washington
- Residential Architect, Port Washington
- Residential Care Facilities, Port Washington
- Residential Construction Contractors, Port Washington - General Contractors
- Restaurant & Lounge, Bar, Or Pub, Port Washington
- Restaurants/Food & Dining, Port Washington
- Retaining Wall Contractors, Port Washington - Build & Repair - Blocks, Concrete, Stones, etc
- Retirement & Estate Planning, Port Washington
- Retirement Planning Consultants & Services, Port Washington
- Roadside Assistance, Road Service & Towing Service, Port Washington
- Roofing Consultants, Port Washington - Roofing Companies
- Roofing Contractors, Port Washington - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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